The monitor is throwing the below error when trying to heck the page:
When entering inside the logs we can see we only have the request and not any repose, we can see it in Waterfall section:
Why does it happening?
it is caused by the field "Allow browser to make a request to" that is set to Domain only, which means that all elements from your page will be loaded if is inside your server, If there is any external element in your URL that must be loaded with the page, you should see the error that you are receiving. The reason for partial works can be a cache matter or other punctual circumstances.